Unknown008
Jan 21, 2010, 08:28 AM
Well, expand it!
Multiply the first term in the first bracket by the first term in the second bracket, then,
Multiply the first term in the first bracket by the second term in the second bracket, then,
Multiply the second term in the first bracket by the first term in the second bracket, then,
Multiply the second term in the first bracket by the second term in the second bracket.
Add those terms that can be added and you're done! :)